New Features
* print parser help and block decorated function execution on parser error
* print parser help when using 'help cmd' if cmd function is decorated
Fixes
* fix crash when printing parser help for parser with required positional args
* prevent false *** No help message on undecorated help cmd
* don't execute decorated function when -h/--help is passed to parser
Refactorings
* better type checker appeasement
Docs
* write readme
* update docstrings
Others
* test build
* build v1.0.0
* update with_parser doc string